Tech:Forward slash in article name causes breakage
A user on English Wikitravel moved several articles to names containing forward slashes, and Mediawiki apparently choked hard on this. See for example en:Venice\Mestre, which will probably resolve as "VeniceMestre".
When it happens
All the live long day, at least as of the current version 1.8.2.
What should happen
The topic name should display with the forward slash, or else an error should be displayed indicating that the topic name is bogus.
How to fix it
Manually updating the edit/move/display URL seems to do the trick. In some cases using a double forward slash helps, in other cases more creative solutions are required.